phagocytosis /phago·cy·to·sis/ (-si-to´sis) the engulfing of microorganisms or other cells and foreign particles by phagocytes.phagocytot´ic
A mechanism by which single cells of the animal kingdom, such as smaller protozoa, engulf and carry particles into the cytoplasm. It differs from endocytosis primarily in the size of the particle rather than in the mechanism; as particles approach the dimensions and solubility of macromolecules, cells take them up by the process of endocytosis.
Cells such as the free-living amebas or the wandering cells of the metazoa often can “sense” the direction of a potential food source and move toward it (chemotaxis). If, when the cell contacts the particle, the particle has the appropriate chemical composition, or surface charge, it adheres to the cell. The cell responds by forming a hollow, conelike cytoplasmic process around the particle, eventually surrounding it completely. Although the particle is internalized by this sequence of events, it is still enclosed in a portion of the cell’s surface membrane and thus isolated from the cell’s cytoplasm. The combined particle and membrane package is referred to as a food or phagocytic vacuole.
Ameboid cells of the metazoa also selectively remove foreign particles, bacteria, and other pathogens by phagocytosis. After the foreign particle or microorganism is trapped in a vacuole inside the macrophage, it is usually digested. To accomplish this, small packets (lysosomes) of lytic proenzymes are introduced into the phagocytic vacuole, where the enzymes are then
dissolved and activated
Phagocytosis is the process of “eating” where the cells (amoeba, neutrophyll and monocyte) moves towards food. The pseudopodium (fake leg) is protrudes and traps food. The food engulfed and digested by lysozyme (enzyme).
Phagocytosis is the process by which one cell engulfs another cell or large particle. For example, white blood cells present in the body engulf harmful microorganisms that enter the body through phagocytosis.
Amoeba captures its food with its pseudopodia, then it engulfs it. The food is then digested inside the food vacoule and the wastes are egested out.